Wound material length
Estimate the length of ribbon, film or other uniform material left on a roll.
Your inputs
Check each input. Use a number within its allowed range and step.
Check stock on a part-used core without unwinding it.
How much material is left on this roll? View the worked example.
How this is calculated
Divide radial build by material thickness for equivalent turns. Multiply by the average circumference, using the core diameter plus one radial build, and convert millimetres to metres. Assume tight, evenly wound material of uniform thickness.
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